How do I pick the perfect watch to wear with a suit? Today we are going to find out, exploring how to think about the question, and EWC's top picks. Let's get into it.The Three Variables That Actually MatterStart with what a suit cuff actually does. It sits roughly an inch past the wrist bone, and it moves throughout the day. When you reach for something, the cuff rides up briefly and retreats. The optimal watch for wearing under this friction environment one that doesn't catch the fabric on the way out, which is a function of lug-to-lug length and lug angle, not case diameter alone. It can also come down to bezel geometry and finishing.Consider two 37mm watches. The IWC Portofino 37 has a lug-to-lug of roughly 43mm. A 37mm watch with less aggressive lug taper might push past 46mm. Both are 37mm. One disappears under a cuff. One doesn't. Diameter tells you about the watch on a table. Lug-to-lug tells you about the watch on a wrist under a sleeve. The downturn of an optimal lug will brush the sleeve up over the watch case, where an aggressively outstretched lug will catch a sleeve in all the wrong ways.